By QuLk @ 2018.7.12
Refer:
https://medium.freecodecamp.org/running-your-own-openvpn-server-on-a-raspberry-pi-8b78043ccdea
https://www.reddit.com/r/China/comments/8hp0kr/shadowsocks_server_on_raspberry_pi/
https://www.linuxbabe.com/linux-server/setup-your-own-shadowsocks-server-on-debian-ubuntu-centos
This article uses RASPBERRY PI 3 MODEL B, OS version: Raspbian GNU/Linux 9 (stretch).